At a distance of 2.00 m from a point source of sound, the intensity level is 80.0 dB. What will be the intensity level at a distance of 4.00 m from this source? The lowest detectable intensity is 1.0 × 10-12 W/m2
A) 77.0 dB
B) 74.0 dB
C) 60.0 dB
D) 40.0 dB
E) 20.0 dB
B
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The primary purpose of a telescope is to
A) collect a large amount of light and bring it into focus. B) magnify distant objects. C) separate light into its component wavelengths. D) measure the brightness of stars very accurately. E) make distant objects appear nearby.
What is the longest wavelength in the Lyman Series?
A) 45.60 nm B) 91.20 nm C) 121.5 nm D) 240.1 nm E) 365 nm
Four waves are described by the following expressions, where distances are measured in meters and times in seconds
I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves travel in the +x direction? A) I and II B) I and III C) II and IV D) I and IV E) II and III
Some species of whales can dive to depths of one kilometer. What is the total pressure they experience at this depth? (rsea = 1 020 kg/m3 and 1.01 × 10^5 N/m2 = 1 ATM.)
a. 9.00 ATM b. 90.0 ATM c. 100 ATM d. 111 ATM e. 130 ATM